Imaging optical lens assembly, image capturing unit and electronic device

ABSTRACT

An imaging optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region. The second lens element with negative refractive power has an object-side surface being concave in a paraxial region. The third lens element has an object-side surface and an image-side surface being aspheric. The fourth lens element with negative refractive power has an object-side surface being concave and an image-side surface being concave in a paraxial region, wherein the image-side surface has convex shape in an off-axis region, and the two surfaces thereof are aspheric. The fifth lens element with positive refractive power has an object-side surface and an image-side surface being both aspheric.

RELATED APPLICATIONS

This application is a continuation patent application of U.S.application Ser. No. 15/046,309, filed on Feb. 17, 2016, which claimspriority under 35 U.S.C. § 119 to Taiwan Application 105101005, filedJan. 13, 2016, each of which is incorporated by reference herein in itsentirety.

BACKGROUND Technical Field

The present disclosure relates to an imaging optical lens assembly, animage capturing unit and an electronic device, more particularly to animaging optical lens assembly and an image capturing unit applicable toan electronic device.

Description of Related Art

In recent years, with the popularity of electronic devices having camerafunctionalities, the demand of miniaturized optical systems has beenincreasing. As the advanced semiconductor manufacturing technologieshave reduced the pixel size of sensors, and compact optical systems havegradually evolved toward the field of higher megapixels, there is anincreasing demand for compact optical systems featuring better imagequality.

Conventional telephoto optical systems have been employed in portableelectronic products for satisfying the various requirements such as highresolution and superior image quality. However, the conventional opticalsystem design has a long track length and small aperture with lowerimage quality and a large size. Therefore, it is undesirable for compactelectronic devices with high-end specifications. Thus, there is a needto develop an optical system featuring a telephoto design with highimage quality.

SUMMARY

According to one aspect of the present disclosure, an imaging opticallens assembly includes, in order from an object side to an image side, afirst lens element, a second lens element, a third lens element, afourth lens element and a fifth lens element. The first lens elementwith positive refractive power has an object-side surface being convexin a paraxial region thereof. The second lens element with negativerefractive power has an object-side surface being concave in a paraxialregion thereof. The third lens element has an object-side surface and animage-side surface being both aspheric. The fourth lens element withnegative refractive power has an object-side surface being concave in aparaxial region thereof and an image-side surface being concave in aparaxial region thereof, wherein the image-side surface of the fourthlens element has at least one convex shape in an off-axis regionthereof, and the object-side surface and the image-side surface of thefourth lens element are both aspheric. The fifth lens element withpositive refractive power has an object-side surface and an image-sidesurface being both aspheric. The imaging optical lens assembly has atotal of five lens elements, and there is an air gap in a paraxialregion between every two of the lens elements that are adjacent to eachother. When a focal length of the imaging optical lens assembly is f, acurvature radius of the object-side surface of the second lens elementis R3, a curvature radius of an image-side surface of the second lenselement is R4, a curvature radius of the image-side surface of the fifthlens element is R10, the following conditions are satisfied:(R3+R4)/(R3−R4)<0.50; andf/|R10|<1.20.

According to another aspect of the present disclosure, an imagingoptical lens assembly includes, in order from an object side to an imageside, a first lens element, a second lens element, a third lens element,a fourth lens element and a fifth lens element. The first lens elementwith positive refractive power has an object-side surface being convexin a paraxial region thereof. The second lens element with negativerefractive power has an object-side surface being concave in a paraxialregion thereof. The third lens element has an object-side surface and animage-side surface being both aspheric. The fourth lens element withnegative refractive power has an object-side surface being concave in aparaxial region thereof and an image-side surface being concave in aparaxial region thereof, wherein the image-side surface of the fourthlens element has at least one convex shape in an off-axis regionthereof, and the object-side surface and the image-side surface of thefourth lens element are both aspheric. The fifth lens element withpositive refractive power has an object-side surface and an image-sidesurface being both aspheric. The imaging optical lens assembly has atotal of five lens elements, and there is an air gap in a paraxialregion between every two of the lens elements that are adjacent to eachother. When a focal length of the imaging optical lens assembly is f, acurvature radius of the object-side surface of the second lens elementis R3, a curvature radius of an image-side surface of the second lenselement is R4, a maximum image height of the imaging optical lensassembly is ImgH, the following conditions are satisfied:(R3+R4)/(R3−R4)<0.50; and0.25<ImgH/f<0.55.

According to still another aspect of the present disclosure, an imagecapturing unit includes one or more of the aforementioned imagingoptical lens assemblies and an image sensor, wherein the image sensor isdisposed on an image surface of the imaging optical lens assembly.

According to yet still another aspect of the present disclosure, anelectronic device includes the aforementioned image capturing unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 a schematic view of an image capturing unit according to the 7thembodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 a schematic view of an image capturing unit according to the 8thembodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 shows an electronic device according to one embodiment;

FIG. 18 shows an electronic device according to another embodiment; and

FIG. 19 shows an electronic device according to still anotherembodiment.

DETAILED DESCRIPTION

An imaging optical lens assembly includes, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element and a fifth lens element. Theimaging optical lens assembly has a total of five lens elements.

There is an air gap in a paraxial region between every two lens elementsof the imaging optical lens assembly that are adjacent to each other;that is, each of the first through fifth lens elements can be a singleand non-cemented lens element. Moreover, the manufacturing process ofthe cemented lenses is more complex than the non-cemented lenses. Inparticular, an image-side surface of one lens element and an object-sidesurface of the following lens element need to have accurate curvature toensure these two lens elements will be highly cemented. However, duringthe cementing process, those two lens elements might not be highlycemented due to displacement and it is thereby not favorable for theimage quality. Therefore, there is an air gap in a paraxial regionbetween every two lens elements of the photographing optical lensassembly that are adjacent to each other in the present disclosure forsolving the problem generated by the cemented lens elements.

The first lens element with positive refractive power has an object-sidesurface being convex in a paraxial region thereof. Therefore, it isfavorable for providing the positive refractive power needed for theimaging optical lens assembly and reducing a total track length.

The second lens element with negative refractive power has anobject-side surface being concave in a paraxial region thereof.Therefore, it is favorable for correcting aberrations generated by thefirst lens element.

The third lens element has an object-side surface and an image-sidesurface, wherein each of the object-side surface and the image-sidesurface of the third lens element can have at least one concave shape inan off-axis region thereof. Therefore, it is favorable for reducing theincident angle of the light projecting onto an image sensor so as toimprove the image-sensing efficiency of the image sensor, therebycorrecting the aberration of the off-axis field.

The fourth lens element with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof.Therefore, it is favorable for reducing a back focal length.Furthermore, the image-side surface of the fourth lens element has atleast one convex shape in an off-axis region thereof so that it isfavorable for reducing a chief ray angle at the peripheral region of theimage, and thereby the image sensor is capable of capturing images athigh resolution.

The fifth lens element with positive refractive power can have anobject-side surface and an image-side surface both being convex in aparaxial region thereof. Therefore, it is favorable for correctingaberrations generated from overly strong refractive power of the firstthrough the fourth lens elements.

When a curvature radius of the object-side surface of the second lenselement is R3, a curvature radius of an image-side surface of the secondlens element is R4, the following condition is satisfied:(R3+R4)/(R3−R4)<0.50. Therefore, it is favorable for preventing thesurfaces of the second lens element from overly curved at the off-axisregion for eliminating the stray light. Preferably, the followingcondition can also be satisfied: (R3+R4)/(R3−R4)<0. Furthermore, thefollowing condition can also be satisfied: −2.5<(R3+R4)/(R3−R4)<0.

When a focal length of the imaging optical lens assembly is f, acurvature radius of the image-side surface of the fifth lens element isR10, the following condition can be satisfied: f/|R10|<1.20. Therefore,it is favorable for obtaining a desirable back focal length bypreventing the shape of the fifth lens element being overly curved. Indetail, when the image-side surface of the fifth lens element is convexin the paraxial region thereof, it is favorable for preventing the backfocal length from too long; when the image-side surface of the fifthlens element is concave in the paraxial region thereof, it is favorablefor preventing the back focal length from too short. By satisfying thecondition, it is favorable for keeping the imaging optical lens assemblycompact with a proper back focal length. Preferably, the followingcondition can also be satisfied: f/|R10|<0.75.

When the focal length of the imaging optical lens assembly is f, amaximum image height of the imaging optical lens assembly (half of adiagonal length of an effective photosensitive area of the image sensor)is ImgH, the following condition can be satisfied: 0.25<ImgH/f<0.55.Therefore, it is favorable for enhancing the telephoto characteristic ofthe imaging optical lens assembly.

When an axial distance between the first lens element and the secondlens element is T12, an axial distance between the second lens elementand the third lens element is T23, an axial distance between the thirdlens element and the fourth lens element is T34, an axial distancebetween the fourth lens element and the fifth lens element is T45, thefollowing condition can be satisfied: 1.0<T34/(T12+T23+T45)<4.0.Therefore, it is favorable for properly arranging the axial distancebetween every two adjacent lens elements so as to reduce the sensitivityof the imaging optical lens assembly while obtaining the telephotocharacteristic simultaneously.

When a focal length of the second lens element is f2, a focal length ofthe fourth lens element is f4, and the following condition can besatisfied: f4/f2<1.0. Therefore, it is favorable for balancing therefractive power of the second lens element and the fourth lens elementso as to prevent the surfaces of the second lens element from overlycurved.

When an Abbe number of the first lens element is V1, an Abbe number ofthe second lens element is V2, an Abbe number of the third lens elementis V3, an Abbe number of the fourth lens element is V4, an Abbe numberof the fifth lens element is V5, the following condition can besatisfied: 0.45<(V2+V3+V5)/(V1+V4)<0.75. Therefore, it is favorable forbalancing between corrections of chromatic aberration and astigmatism.

When the axial distance between the third lens element and the fourthlens element is T34, an axial distance between the image-side surface ofthe fifth lens element and an image surface is BL, the followingcondition can be satisfied: 1.20<T34/BL<2.5. Therefore, it is favorablefor obtaining a proper chief ray angle so as to further improve theimage-sensing efficiency of the image sensor.

When a curvature radius of the object-side surface of the fourth lenselement is R7, a curvature radius of the image-side surface of thefourth lens element is R8, the following condition can be satisfied:−1.0<R7/R8<0. Therefore, it is favorable for further reducing the backfocal length.

When an axial distance between the object-side surface of the first lenselement and the image surface is TL, the focal length of the imagingoptical lens assembly is f, the following condition can be satisfied:0.75<TL/f<1.10. Therefore, it is favorable for reducing the total tracklength while obtaining the telephoto characteristic.

When the focal length of the imaging optical lens assembly is f, thefocal length of the second lens element is f2, a focal length of thethird lens element is f3, the focal length of the fourth lens element isf4, the following condition can be satisfied:−4.0<(f/f2)+(f/f3)+(f/f4)<−2.0. Therefore, it is favorable forcorrecting the field curvature generated by the first lens element.

When the axial distance between the first lens element and the secondlens element is T12, the axial distance between the second lens elementand the third lens element is T23, the following condition can besatisfied: 0<T23/T12<1.75. Therefore, it is favorable for preventing theaxial distance between the first lens element and the second lenselement from overly short so as to provide an easier lens assemblingprocess, thereby increasing the assembling yield rate.

When the Abbe number of the fourth lens element is V4, the Abbe numberof the fifth lens element is V5, the following condition can besatisfied: 1.8<V4/V5<3.5. Therefore, it is favorable for correctingchromatic aberration.

When the focal length of the imaging optical lens assembly is f, thefocal length of the third lens element is f3, the following conditioncan be satisfied: −1.2<f/f3≤0. Therefore, it is favorable for enhancingthe aberration correction capability so as to improve the image quality.

According to the present disclosure, an aperture stop can be disposed asa front stop or a middle stop. A front stop disposed between the imagedobject and the first lens element can produce a telecentric effect byproviding a longer distance between an exit pupil and the image surface,thereby improving the image-sensing efficiency of an image sensor (forexample, CCD or CMOS). A middle stop disposed between the first lenselement and the image surface is favorable for enlarging the view angleand thereby provides a wider field of view.

According to the present disclosure, the lens elements of the imagingoptical lens assembly can be made of glass or plastic material. When thelens elements are made of glass material, the refractive powerdistribution of the imaging optical lens assembly may be more flexibleto design. When the lens elements are made of plastic material,manufacturing costs can be effectively reduced. Furthermore, surfaces ofeach lens element can be arranged to be aspheric, since the asphericsurface of the lens element is easy to form a shape other than aspherical surface so as to have more controllable variables foreliminating aberrations thereof and to further decrease the requirednumber of the lens elements. Therefore, the total track length of theimaging optical lens assembly can also be reduced.

According to the present disclosure, each of an object-side surface andan image-side surface has a paraxial region and an off-axis region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axis region refers to theregion of the surface away from the paraxial region. Particularly unlessotherwise stated, when the lens element has a convex surface, itindicates that the surface can be convex in the paraxial region thereof;when the lens element has a concave surface, it indicates that thesurface can be concave in the paraxial region thereof. Moreover, when aregion of refractive power or focus of a lens element is not defined, itindicates that the region of refractive power or focus of the lenselement can be in the paraxial region thereof.

According to the present disclosure, an image surface of the imagingoptical lens assembly on the corresponding image sensor can be flat orcurved, particularly a concave curved surface facing towards the objectside of the imaging optical lens assembly.

According to the present disclosure, the imaging optical lens assemblycan include at least one stop, such as an aperture stop, a glare stop ora field stop. Said glare stop or said field stop is allocated foreliminating the stray light and thereby improving the image qualitythereof.

According to the present disclosure, an image capturing unit includesthe aforementioned imaging optical lens assembly and an image sensor,wherein the image sensor is disposed on the image side and can belocated on or near an image surface of the aforementioned imagingoptical lens assembly. In some embodiments, the image capturing unit canfurther include a barrel member, a holding member or a combinationthereof.

In FIG. 17, FIG. 18, and FIG. 19, an image capturing unit 10 may beinstalled in, but not limited to, an electronic device, including asmart phone (FIG. 17), a tablet personal computer (FIG. 18) or awearable device (FIG. 19). The electronic devices shown in the figuresare only exemplary for showing the image capturing unit of the presentdisclosure installed in an electronic device and are not limitedthereto. In some embodiments, the electronic device can further include,but not limited to, a display unit, a control unit, a storage unit, arandom access memory unit (RAM), a read only memory unit (ROM) or acombination thereof.

According to the present disclosure, the imaging optical lens assemblycan be optionally applied to optical systems with a movable focus.Furthermore, the imaging optical lens assembly is featured with goodcapability in aberration corrections and high image quality, and can beapplied to 3D (three-dimensional) image capturing applications, inproducts such as such as digital cameras, mobile devices, digitaltablets, wearable devices, smart televisions, network surveillancedevices, motion sensing input devices, dashboard cameras, vehicle backupcameras and other electronic imaging devices. According to the abovedescription of the present disclosure, the following specificembodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 180. The imaging optical lens assemblyincludes, in order from an object side to an image side, an aperturestop 100, a first lens element 110, a second lens element 120, a thirdlens element 130, a fourth lens element 140, a fifth lens element 150,an IR-cut filter 160 and an image surface 170, wherein the imagingoptical lens assembly has a total of five lens elements (110-150). Thereis an air gap in a paraxial region between every two of the first lenselement 110, the second lens element 120, the third lens element 130,the fourth lens element 140 and the fifth lens element 150 that areadjacent to each other.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material and has theobject-side surface 111 and the image-side surface 112 being bothaspheric.

The second lens element 120 with negative refractive power has anobject-side surface 121 being concave in a paraxial region thereof andan image-side surface 122 being convex in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 has an object-side surface 131 being planarin a paraxial region thereof and an image-side surface 132 being planarin a paraxial region thereof. The third lens element 130 is made ofplastic material and has the object-side surface 131 and the image-sidesurface 132 being both aspheric. The object-side surface 131 has atleast one concave shape in an off-axis region thereof. The image-sidesurface 132 has at least one concave shape in an off-axis regionthereof.

The fourth lens element 140 with negative refractive power has anobject-side surface 141 being concave in a paraxial region thereof andan image-side surface 142 being concave in a paraxial region thereof.The fourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric. The image-side surface 142 of the fourth lens element 140 hasat least one convex shape in an off-axis region thereof.

The fifth lens element 150 with positive refractive power has anobject-side surface 151 being convex in a paraxial region thereof and animage-side surface 152 being planar in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric.

The IR-cut filter 160 is made of glass material and located between thefifth lens element 150 and the image surface 170, and will not affectthe focal length of the imaging optical lens assembly. The image sensor180 is disposed on or near the image surface 170 of the imaging opticallens assembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:X(Y)=(Y ² /R)/(1+sqrt(1−(1+k)×(Y/R)²))+Σ_(i)(Ai)×(Y ^(i)),where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14 and 16.

In the imaging optical lens assembly of the image capturing unitaccording to the 1st embodiment, when a focal length of the imagingoptical lens assembly is f, an f-number of the imaging optical lensassembly is Fno, and half of a maximal field of view of the imagingoptical lens assembly is HFOV, these parameters have the followingvalues: f=6.29 millimeters (mm), Fno=3.00; and HFOV=24.9 degrees (deg.).

When an Abbe number of the first lens element 110 is V1, an Abbe numberof the second lens element 120 is V2, an Abbe number of the third lenselement 130 is V3, an Abbe number of the fourth lens element 140 is V4,an Abbe number of the fifth lens element 150 is V5, the followingcondition is satisfied: (V2+V3+V5)/(V1+V4)=0.54.

When the Abbe number of the fourth lens element 140 is V4, the Abbenumber of the fifth lens element 150 is V5, the following condition issatisfied: V4/V5=2.75.

When an axial distance between the first lens element 110 and the secondlens element 120 is T12, an axial distance between the second lenselement 120 and the third lens element 130 is T23, the followingcondition is satisfied: T23/T12=0.32.

When the axial distance between the first lens element 110 and thesecond lens element 120 is T12, the axial distance between the secondlens element 120 and the third lens element 130 is T23, an axialdistance between the third lens element 130 and the fourth lens element140 is T34, an axial distance between the fourth lens element 140 andthe fifth lens element 150 is T45, the following condition is satisfied:T34/(T12+T23+T45)=2.73.

When the axial distance between the third lens element 130 and thefourth lens element 140 is T34, an axial distance between the image-sidesurface 152 of the fifth lens element 150 and the image surface 170 isBL, the following condition is satisfied: T34/BL=1.84.

When an axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 170 is TL, the focal length ofthe imaging optical lens assembly is f, the following condition issatisfied: TL/f=0.89.

When a maximum image height of the imaging optical lens assembly isImgH, the focal length of the imaging optical lens assembly is f, thefollowing condition is satisfied: ImgH/f=0.47.

When a curvature radius of the object-side surface 121 of the secondlens element 120 is R3, a curvature radius of the image-side surface 122of the second lens element 120 is R4, the following condition issatisfied: (R3+R4)/(R3−R4)=−1.15.

When a curvature radius of the object-side surface 141 of the fourthlens element 140 is R7, a curvature radius of the image-side surface 142of the fourth lens element 140 is R8, the following condition issatisfied: R7/R8=−0.06.

When the focal length of the imaging optical lens assembly is f, acurvature radius of the image-side surface 152 of the fifth lens element150 is R10, the following condition is satisfied: f/|R10|=0.

When the focal length of the imaging optical lens assembly is f, a focallength of the second lens element 120 is f2, a focal length of the thirdlens element 130 is f3, a focal length of the fourth lens element 140 isf4, the following condition is satisfied: (f/f2)+(f/f3)+(f/f4)=−2.55.

When the focal length of the imaging optical lens assembly is f, thefocal length of the third lens element 130 is f3, the followingcondition is satisfied: f/f3=0.

When the focal length of the second lens element 120 is f2, the focallength of the fourth lens element 140 is f4, the following condition issatisfied: f4/f2=0.80.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 6.29 mm, Fno = 3.00, HFOV = 24.9 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.498  2 Lens 1  1.360 (ASP) 0.983Plastic 1.515 56.5  3.02 3  8.299 (ASP) 0.255 4 Lens 2 −3.382 (ASP)0.240 Plastic 1.660 20.4 −5.53 5 −47.602  (ASP) 0.081 6 Lens 3 ∞ (ASP)0.320 Plastic 1.660 20.4 ∞ 7 ∞ (ASP) 1.505 8 Lens 4 −2.567 (ASP) 0.320Plastic 1.544 56.0 −4.45 9 45.176 (ASP) 0.216 10 Lens 5 15.059 (ASP)0.849 Plastic 1.660 20.4 22.82 11 ∞ (ASP) 0.300 12 IR-cut filter Plano0.210 Glass 1.517 64.2 — 13 Plano 0.309 14 Image Plano — Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the image-sidesurface of the second lens element (Surface 5) is 0.880 mm.

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 6 k = −1.2001E+00 −4.7039E+01 −1.7270E+01 −8.8668E+01   0.0000E+00 A4 = 6.0246E−02 4.8948E−02  4.9917E−02 1.8884E−02 −3.7609E−02 A6 = 1.6751E−02−1.0033E−02 −2.5978E−01 −4.7281E−01  −4.7122E−02 A8 = 4.0725E−03−2.2803E−02  3.8058E−01 1.7524E−01 −1.3504E+00 A10 = 3.1200E−03−3.8013E−02 −6.7434E−01 4.6336E−01  3.5253E+00 A12 = 1.5104E−03 1.1314E−02  6.7813E−01 −5.2948E−01  −3.7789E+00 A14 = — — −2.6045E−011.6669E−01  1.4062E+00 A16 = — — — — −1.8085E−09 Surface # 7 8 9 10 11 k= 0.0000E+00 −9.6890E+00 −8.9997E+01 −1.3963E+00  0.0000E+00 A4 =1.1183E−01 −3.3992E−02  4.4171E−02 −3.8242E−03 −4.5634E−02 A6 =7.2768E−02 −2.3472E−02 −5.8044E−02 −1.3674E−04  1.7063E−02 A8 =−3.1392E−01   2.8505E−02  2.9257E−02 −1.5358E−03 −5.1959E−03 A10 =7.0758E−01 −1.0816E−02 −9.1650E−03  1.1265E−05  8.1941E−04 A12 =−7.3955E−01   2.1598E−03  1.7804E−03  1.1704E−04 −8.4222E−05 A14 =2.8943E−01 −2.1961E−04 −1.9360E−04 −1.8050E−05  7.3868E−06 A16 =3.3786E−09  8.0030E−06  8.8069E−06  6.6217E−07 −3.3790E−07

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-14 represent the surfacessequentially arranged from the object-side to the image-side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A16 represent the asphericcoefficients ranging from the 4th order to the 8th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the terms in thetables are the same as Table 1 and Table 2 of the 1st embodiment.Therefore, an explanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 280. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 210, an aperture stop 200, a second lens element 220, a thirdlens element 230, a fourth lens element 240, a fifth lens element 250,an IR-cut filter 260 and an image surface 270, wherein the imagingoptical lens assembly has a total of five lens elements (210-250). Thereis an air gap in a paraxial region between every two of the first lenselement 210, the second lens element 220, the third lens element 230,the fourth lens element 240 and the fifth lens element 250 that areadjacent to each other.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being convex in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric.

The second lens element 220 with negative refractive power has anobject-side surface 221 being concave in a paraxial region thereof andan image-side surface 222 being planar in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with negative refractive power has anobject-side surface 231 being concave in a paraxial region thereof andan image-side surface 232 being convex in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric. The object-side surface 231 of the third lens element 230 hasat least one concave shape in an off-axis region thereof. The image-sidesurface 232 of the third lens element 230 has at least one concave shapein an off-axis region thereof.

The fourth lens element 240 with negative refractive power has anobject-side surface 241 being concave in a paraxial region thereof andan image-side surface 242 being concave in a paraxial region thereof.The fourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric. The image-side surface 242 of the fourth lens element 240 hasat least one convex shape in an off-axis region thereof.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being convex in a paraxial region thereof and animage-side surface 252 being concave in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric.

The IR-cut filter 260 is made of glass material and located between thefifth lens element 250 and the image surface 270, and will not affectthe focal length of the imaging optical lens assembly. The image sensor280 is disposed on or near the image surface 270 of the imaging opticallens assembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 5.99 mm, Fno = 2.80, HFOV = 25.9 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Lens 1 1.611 (ASP) 1.098 Plastic 1.515 56.5 3.01 2−29.842 (ASP) 0.000 3 Ape. Stop Plano 0.253 4 Lens 2 −4.909 (ASP) 0.240Plastic 1.660 20.4 −7.44 5 ∞ (ASP) 0.135 6 Lens 3 −5.406 (ASP) 0.320Plastic 1.660 20.4 −26.07 7 −8.069 (ASP) 0.806 8 Lens 4 −8.415 (ASP)1.135 Plastic 1.544 56.0 −4.86 9 4.039 (ASP) 0.196 10 Lens 5 6.153 (ASP)0.731 Plastic 1.660 20.4 17.62 11 12.452 (ASP) 0.300 12 IR-cut filterPlano 0.210 Glass 1.517 64.2 — 13 Plano 0.573 14 Image Plano — Note:Reference wavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 1 2 4 5 6 k = −1.5987E+001.0000E+01 −2.5931E+01 0.0000E+00 1.8992E−16 A4 =  4.4978E−02 1.9102E−02 4.9028E−02 2.2939E−02 −1.7172E−02  A6 = −2.8449E−04 −2.9350E−02 −2.7800E−01 −4.2737E−01  3.9204E−02 A8 =  4.9676E−03 1.2080E−02 5.4089E−01 2.5999E−01 −1.3322E+00  A10 = −3.0291E−03 −1.1846E−02 −7.4438E−01 3.8712E−01 3.5906E+00 A12 =  2.1836E−04 1.1314E−02 6.7813E−01 −5.2948E−01  −3.7789E+00  A14 = — — −2.6045E−01 1.6669E−011.4062E+00 A16 = — — — — 1.8509E−08 Surface # 7 8 9 10 11 k =−1.0000E+00  8.3103E−01 −3.1636E+01 −1.3963E+00  3.0395E−08 A4 = 8.0921E−02 −2.9569E−02  3.2620E−02 −1.0473E−02 −1.7398E−02 A6 = 4.9947E−02 −2.1878E−02 −5.1966E−02 −2.6951E−02 −1.5236E−02 A8 =−2.2926E−01  2.3826E−02  2.8496E−02  1.6894E−02  8.3300E−03 A10 = 7.2112E−01 −1.2924E−02 −9.2634E−03 −4.8098E−03 −1.9567E−03 A12 =−7.8578E−01  5.0207E−03  1.7871E−03  7.4907E−04  2.6014E−04 A14 = 2.8943E−01 −7.7064E−04 −1.8903E−04 −6.1182E−05 −1.9291E−05 A16 =−5.8601E−07  8.0030E−06  8.3346E−06  1.9543E−06  6.0075E−07

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 5.99 TL/f 1.00 Fno 2.80 ImgH/f 0.49 HFOV [deg.]25.9 (R3 + R4)/(R3 − R4) −1.00 (V2 + V3 + V5)/(V1 + V4) 0.54 R7/R8 −2.08V4/V5 2.75 f/|R10| 0.48 T23/T12 0.53 (f/f2) + (f/f3) + (f/f4) −2.27T34/(T12 + T23 + T45) 1.38 f/f3 −0.23 T34/BL 0.74 f4/f2 0.65

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 380. The imaging optical lens assemblyincludes, in order from an object side to an image side, an aperturestop 300, a first lens element 310, a second lens element 320, a thirdlens element 330, a fourth lens element 340, a fifth lens element 350,an IR-cut filter 360 and an image surface 370, wherein the imagingoptical lens assembly has a total of five lens elements (310-350). Thereis an air gap in a paraxial region between every two of the first lenselement 310, the second lens element 320, the third lens element 330,the fourth lens element 340 and the fifth lens element 350 that areadjacent to each other.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with negative refractive power has anobject-side surface 321 being concave in a paraxial region thereof andan image-side surface 322 being concave in a paraxial region thereof.The second lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with negative refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being concave in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric. The object-side surface 331 of the third lens element 330 hasat least one concave shape in an off-axis region thereof. The image-sidesurface 332 of the third lens element 330 has at least one concave shapein an off-axis region thereof.

The fourth lens element 340 with negative refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being concave in a paraxial region thereof.The fourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric. The image-side surface 342 of the fourth lens element 340 hasat least one convex shape in an off-axis region thereof.

The fifth lens element 350 with positive refractive power has anobject-side surface 351 being convex in a paraxial region thereof and animage-side surface 352 being concave in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric.

The IR-cut filter 360 is made of glass material and located between thefifth lens element 350 and the image surface 370, and will not affectthe focal length of the imaging optical lens assembly. The image sensor380 is disposed on or near the image surface 370 of the imaging opticallens assembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 6.29 mm, Fno = 2.82, HFOV = 25.1 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.520  2 Lens 1 1.424 (ASP) 0.788Plastic 1.515 56.5 2.97 3 17.073 (ASP) 0.353 4 Lens 2 −5.828 (ASP) 0.332Plastic 1.660 20.4 −6.05 5 12.961 (ASP) 0.154 6 Lens 3 91.911 (ASP)0.320 Plastic 1.660 20.4 −29.18 7 15.898 (ASP) 1.383 8 Lens 4 −3.569(ASP) 0.320 Plastic 1.544 56.0 −4.20 9 6.564 (ASP) 0.256 10 Lens 5 9.179(ASP) 0.864 Plastic 1.660 20.4 14.37 11 278.022 (ASP) 0.300 12 IR-cutfilter Plano 0.210 Glass 1.517 64.2 — 13 Plano 0.311 14 Image Plano —Note: Reference wavelength is 587.6 nm (d-line). An effective radius ofthe image-side surface of the second lens element (Surface 5) is 0.880mm. An effective radius of the image-side surface of the third lenselement (Surface 7) is 0.850 mm.

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 6 k = −1.2954E+00−4.1469E+01 −8.9586E+01 −8.9917E+01 −8.8785E+01 A4 =   5.6089E−02  3.9438E−02   4.7487E−02   3.3128E−02 −5.7531E−02 A6 =   1.0947E−02−3.7807E−02 −2.3035E−01 −4.1654E−01 −7.0974E−02 A8 = −6.0035E−03  3.1934E−02   5.0795E−01   3.4254E−01 −1.1177E+00 A10 =   1.2929E−02−2.9931E−02 −7.5015E−01   2.5441E−01   3.3170E+00 A12 = −5.9628E−03  1.1395E−02   6.7826E−01 −5.2822E−01 −3.7772E+00 A14 = — — −2.6174E−01  1.6893E−01   1.4099E+00 Surface # 7 8 9 10 11 k = −1.0004E+00−2.8039E+01 −8.9107E+01 −1.0193E+00 −8.7813E+01 A4 =   8.3186E−02−4.6352E−02   4.0723E−02 −4.5265E−02 −6.5168E−02 A6 =   3.6283E−02−1.9884E−02 −5.7746E−02   4.2475E−02   2.7245E−02 A8 = −2.9200E−01  2.9701E−02   2.9319E−02 −2.6964E−02 −7.7641E−03 A10 =   8.3032E−01−1.1160E−02 −9.1666E−03   8.0071E−03   6.5382E−04 A12 = −8.4880E−01  2.0909E−03   1.7828E−03 −1.2194E−03   7.6614E−05 A14 =   2.8860E−01−2.0278E−04 −1.9521E−04   9.5710E−05 −1.3232E−05 A16 = —   8.0030E−06  8.9677E−06 −3.2661E−06   4.4645E−07

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 6.29 TL/f 0.89 Fno 2.82 ImgH/f 0.47 HFOV [deg.]25.1 (R3 + R4)/(R3 − R4) −0.38 (V2 + V3 + V5)/(V1 + V4) 0.54 R7/R8 −0.54V4/V5 2.75 f/|R10| 0.02 T23/T12 0.44 (f/f2) + (f/f3) + (f/f4) −2.75T34/(T12 + T23 + T45) 1.81 f/f3 −0.22 T34/BL 1.69 f4/f2 0.69

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 480. The imaging optical lens assemblyincludes, in order from an object side to an image side, an aperturestop 400, a first lens element 410, a second lens element 420, a thirdlens element 430, a fourth lens element 440, a fifth lens element 450,an IR-cut filter 460 and an image surface 470, wherein the imagingoptical lens assembly has a total of five lens elements (410-450). Thereis an air gap in a paraxial region between every two of the first lenselement 410, the second lens element 420, the third lens element 430,the fourth lens element 440 and the fifth lens element 450 that areadjacent to each other.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being concave in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric.

The second lens element 420 with negative refractive power has anobject-side surface 421 being concave in a paraxial region thereof andan image-side surface 422 being convex in a paraxial region thereof. Thesecond lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric.

The third lens element 430 with negative refractive power has anobject-side surface 431 being concave in a paraxial region thereof andan image-side surface 432 being concave in a paraxial region thereof.The third lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric. The object-side surface 431 of the third lens element 430 hasat least one concave shape in an off-axis region thereof. The image-sidesurface 432 of the third lens element 430 has at least one concave shapein an off-axis region thereof.

The fourth lens element 440 with negative refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being concave in a paraxial region thereof.The fourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric. The image-side surface 442 of the fourth lens element 440 hasat least one convex shape in an off-axis region thereof.

The fifth lens element 450 with positive refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being convex in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric.

The IR-cut filter 460 is made of glass material and located between thefifth lens element 450 and the image surface 470, and will not affectthe focal length of the imaging optical lens assembly. The image sensor480 is disposed on or near the image surface 470 of the imaging opticallens assembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 6.31 mm, Fno = 2.82, HFOV = 25.1 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.500  2 Lens 1 1.457 (ASP) 0.764Plastic 1.544 56.0 2.97 3 12.080 (ASP) 0.323 4 Lens 2 −5.548 (ASP) 0.342Plastic 1.660 20.4 −11.94 5 −19.196 (ASP) 0.181 6 Lens 3 −5.796 (ASP)0.320 Plastic 1.660 20.4 −8.47 7 160.862 (ASP) 1.420 8 Lens 4 −3.796(ASP) 0.330 Plastic 1.544 56.0 −4.54 9 7.266 (ASP) 0.273 10 Lens 513.503 (ASP) 0.817 Plastic 1.660 20.4 14.80 11 −34.443 (ASP) 0.300 12IR-cut filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 0.317 14 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line). An effectiveradius of the image-side surface of the second lens element (Surface 5)is 0.880 mm. An effective radius of the image-side surface of the thirdlens element (Surface 7) is 0.840 mm.

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 6 k = −1.3082E+00−4.1469E+01 −8.9388E+01 −8.9916E+01 −8.8473E+01 A4 =   5.1169E−02  4.5971E−02   5.8127E−02   1.2807E−01   8.5893E−02 A6 =   2.3679E−02−5.9938E−02 −2.2682E−01 −5.0291E−01 −3.8081E−01 A8 = −3.3515E−02  5.6887E−02   3.6281E−01   5.2973E−01   1.2617E−01 A10 =   3.8104E−02−5.8829E−02 −4.9663E−01 −3.5753E−01   4.3029E−01 A12 = −1.6171E−02  2.2436E−02   4.5413E−01   2.0641E−01 −8.3436E−01 A14 = — — −1.7317E−01−9.6000E−02   3.7764E−01 Surface # 7 8 9 10 11 k = −1.0000E+00−2.4268E+01 −8.9110E+01 −1.0000E+00 −8.7813E+01 A4 =   1.7623E−01−1.9803E−02   5.8357E−02 −3.2357E−02 −6.9236E−02 A6 = −4.9364E−02−2.8700E−02 −7.3350E−02   3.5309E−02   4.0441E−02 A8 = −7.8056E−02  2.5751E−02   3.7245E−02 −2.7997E−02 −1.8995E−02 A10 =   2.7341E−01−8.3224E−03 −1.1808E−02   8.9661E−03   4.5302E−03 A12 = −2.5243E−01  1.4313E−03   2.2929E−03 −1.4005E−03 −6.2819E−04 A14 =   6.8824E−02−1.3235E−04 −2.4566E−04   1.0984E−04   5.5255E−05 A16 = —   5.1319E−06  1.0860E−05 −3.6485E−06 −2.3065E−06

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 6.31 TL/f 0.89 Fno 2.82 ImgH/f 0.46 HFOV [deg.]25.1 (R3 + R4)/(R3 − R4) −1.81 (V2 + V3 + V5)/(V1 + V4) 0.55 R7/R8 −0.52V4/V5 2.75 f/|R10| 0.18 T23/T12 0.56 (f/f2) + (f/f3) + (f/f4) −2.66T34/(T12 + T23 + T45) 1.83 f/f3 −0.74 T34/BL 1.72 f4/f2 0.38

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 580. The imaging optical lens assemblyincludes, in order from an object side to an image side, an aperturestop 500, a first lens element 510, a second lens element 520, a thirdlens element 530, a fourth lens element 540, a fifth lens element 550,an IR-cut filter 560 and an image surface 570, wherein the imagingoptical lens assembly has a total of five lens elements (510-550). Thereis an air gap in a paraxial region between every two of the first lenselement 510, the second lens element 520, the third lens element 530,the fourth lens element 540 and the fifth lens element 550 that areadjacent to each other.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being convex in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric.

The second lens element 520 with negative refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being concave in a paraxial region thereof.The second lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with negative refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric. The object-side surface 531 of the third lens element 530 hasat least one concave shape in an off-axis region thereof. The image-sidesurface 532 of the third lens element 530 has at least one concave shapein an off-axis region thereof.

The fourth lens element 540 with negative refractive power has anobject-side surface 541 being concave in a paraxial region thereof andan image-side surface 542 being concave in a paraxial region thereof.The fourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric. The image-side surface 542 of the fourth lens element 540 hasat least one convex shape in an off-axis region thereof.

The fifth lens element 550 with positive refractive power has anobject-side surface 551 being convex in a paraxial region thereof and animage-side surface 552 being concave in a paraxial region thereof. Thefifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric.

The IR-cut filter 560 is made of glass material and located between thefifth lens element 550 and the image surface 570, and will not affectthe focal length of the imaging optical lens assembly. The image sensor580 is disposed on or near the image surface 570 of the imaging opticallens assembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 6.29 mm, Fno = 2.82, HFOV = 25.1 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.520  2 Lens 1 1.410 (ASP) 0.836Plastic 1.515 56.5 2.68 3 −52.230 (ASP) 0.232 4 Lens 2 −4.390 (ASP)0.294 Plastic 1.639 23.5 −4.44 5 8.233 (ASP) 0.189 6 Lens 3 5.937 (ASP)0.320 Plastic 1.639 23.5 −26.16 7 4.288 (ASP) 1.497 8 Lens 4 −3.471(ASP) 0.320 Plastic 1.544 56.0 −4.00 9 6.040 (ASP) 0.151 10 Lens 5 6.246(ASP) 0.925 Plastic 1.639 23.5 10.03 11 239.051 (ASP) 0.300 12 IR-cutfilter Plano 0.210 Glass 1.517 64.2 — 13 Plano 0.316 14 Image Plano —Note: Reference wavelength is 587.6 nm (d-line). An effective radius ofthe image-side surface of the second lens element (Surface 5) is 0.880mm. An effective radius of the image-side surface of the third lenselement (Surface 7) is 0.850 mm. An effective radius of the object-sidesurface of the fourth lens element (Surface 8) is 1.850 mm.

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 k = −1.3073E+00−4.1469E+01 −8.9586E+01 −8.9917E+01 −8.8785E+01 A4 =   5.8181E−02  7.1849E−02   3.1579E−02   5.5627E−02 −4.3733E−02 A6 =   1.5749E−02−1.2563E−01 −2.5900E−01 −5.9135E−01 −2.0587E−01 A8 = −2.2002E−02  1.4774E−01   5.9136E−01   1.0812E+00 −7.0561E−01 A10 =   3.1914E−02−1.2165E−01 −7.4219E−01 −1.0069E+00   2.6084E+00 A12 = −1.5084E−02  4.2911E−02   5.4171E−01   5.0507E−01 −3.2450E+00 A14 = — — −1.6756E−01−1.5249E−01   1.2714E+00 Surface # 7 8 9 10 11 k = −1.0004E+00−2.8039E+01 −8.9107E+01 −1.0193E+00 −8.7813E+01 A4 =   6.9505E−02−5.1570E−02   4.0472E−02 −5.3868E−02 −5.8748E−02 A6 = −2.5666E−02  1.0335E−02 −4.0767E−02   4.6222E−02   1.4231E−02 A8 = −2.0565E−01  1.5471E−04   1.6932E−02 −2.6356E−02   1.6336E−03 A10 =   6.9643E−01  1.5352E−03 −4.7526E−03   6.9186E−03 −2.8505E−03 A12 = −7.2301E−01−7.3319E−04   8.5464E−04 −8.8172E−04   7.5282E−04 A14 =   2.4963E−01  1.1659E−04 −8.6140E−05   5.2346E−05 −7.6213E−05 A16 = — −6.4457E−06  3.6181E−06 −1.1464E−06   2.6731E−06

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 6.29 TL/f 0.89 Fno 2.82 ImgH/f 0.47 HFOV [deg.]25.1 (R3 + R4)/(R3 − R4) −0.30 (V2 + V3 + V5)/(V1 + V4) 0.63 R7/R8 −0.57V4/V5 2.38 f/|R10| 0.03 T23/T12 0.81 (f/f2) + (f/f3) + (f/f4) −3.23T34/(T12 + T23 + T45) 2.62 f/f3 −0.24 T34/BL 1.81 f4/f2 0.90

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 680. The imaging optical lens assemblyincludes, in order from an object side to an image side, an aperturestop 600, a first lens element 610, a second lens element 620, a thirdlens element 630, a fourth lens element 640, a fifth lens element 650,an IR-cut filter 660 and an image surface 670, wherein the imagingoptical lens assembly has a total of five lens elements (610-650). Thereis an air gap in a paraxial region between every two of the first lenselement 610, the second lens element 620, the third lens element 630,the fourth lens element 640 and the fifth lens element 650 that areadjacent to each other.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being concave in a paraxial region thereof. Thefirst lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric.

The second lens element 620 with negative refractive power has anobject-side surface 621 being concave in a paraxial region thereof andan image-side surface 622 being convex in a paraxial region thereof. Thesecond lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric.

The third lens element 630 with negative refractive power has anobject-side surface 631 being concave in a paraxial region thereof andan image-side surface 632 being convex in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric. The object-side surface 631 of the third lens element 630 hasat least one concave shape in an off-axis region thereof. The image-sidesurface 632 of the third lens element 630 has at least one concave shapein an off-axis region thereof.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being concave in a paraxial region thereof andan image-side surface 642 being concave in a paraxial region thereof.The fourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric. The image-side surface 642 of the fourth lens element 640 hasat least one convex shape in an off-axis region thereof.

The fifth lens element 650 with positive refractive power has anobject-side surface 651 being concave in a paraxial region thereof andan image-side surface 652 being convex in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric.

The IR-cut filter 660 is made of glass material and located between thefifth lens element 650 and the image surface 670, and will not affectthe focal length of the imaging optical lens assembly. The image sensor680 is disposed on or near the image surface 670 of the imaging opticallens assembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 6.01 mm, Fno = 2.80, HFOV = 25.7 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.436  2 Lens 1 1.531 (ASP)1.068 Plastic 1.530 55.8 2.95 3 54.067 (ASP) 0.221 4 Lens 2 −3.887 (ASP)0.300 Plastic 1.650 21.5 −6.65 5 −39.267 (ASP) 0.148 6 Lens 3 −4.233(ASP) 0.320 Plastic 1.650 21.5 −63.02 7 −4.861 (ASP) 0.769 8 Lens 4−18.620 (ASP) 0.823 Plastic 1.544 56.0 −5.99 9 4.009 (ASP) 0.323 10 Lens5 −100.000 (ASP) 1.198 Plastic 1.639 23.5 170.03 11 −52.301 (ASP) 0.30012 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 0.319 14 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 6 k = −1.4285E+00−9.4628E+00 −2.3684E+01 −9.0000E+01 −3.2549E−17 A4 =   5.0162E−02  3.7702E−02   5.7703E−02   4.5484E−02 −5.0770E−02 A6 =   8.5032E−03−2.8467E−02 −2.8271E−01 −4.3623E−01   7.3058E−02 A8 = −4.6244E−04−2.6098E−02   4.5691E−01   2.0866E−01 −1.2662E+00 A10 =    3.8855E−03  1.1042E−02 −6.9522E−01   3.8424E−01   3.4427E+00 A12 = −1.3550E−03  4.5001E−03   6.7615E−01 −5.2115E−01 −3.7655E+00 A14 = — — −2.6225E−01  1.8081E−01   1.4062E+00 A16 = — — — —   3.6434E−02 Surface # 7 8 9 1011 k = −2.2950E+00 −2.5657E+00 −2.5399E+01 −1.3963E+00   2.2647E−08 A4 =  4.7219E−02 −3.9372E−02   1.3920E−02 −8.3179E−03 −1.7977E−02 A6 =  1.2163E−01 −3.8446E−02 −4.5974E−02 −4.6740E−03 −6.0815E−03 A8 =−3.7933E−01   6.1743E−02   2.8379E−02 −1.6234E−03   3.8442E−03 A10 =  1.1938E+00 −3.1998E−02 −9.5644E−03   2.2962E−03 −9.6053E−04 A12 =−1.4998E+00   6.3736E−03   1.8122E−03 −8.1429E−04   1.1465E−04 A14 =  7.5271E−01   6.6901E−05 −1.8641E−04   1.3018E−04 −5.3314E−06 A16 =−1.0623E−01 −1.1614E−04   8.0409E−06 −7.9548E−06   3.0672E−08

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 6.01 TL/f 1.00 Fno 2.80 ImgH/f 0.49 HFOV [deg.]25.7 (R3 + R4)/(R3 − R4) −1.22 (V2 + V3 + V5)/(V1 + V4) 0.59 R7/R8 −4.64V4/V5 2.38 f/|R10| 0.11 T23/T12 0.67 (f/f2) + (f/f3) + (f/f4) −2.00T34/(T12 + T23 + T45) 1.11 f/f3 −0.10 T34/BL 0.93 f4/f2 0.90

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 780. The imaging optical lens assemblyincludes, in order from an object side to an image side, an aperturestop 700, a first lens element 710, a second lens element 720, a thirdlens element 730, a fourth lens element 740, a fifth lens element 750,an IR-cut filter 760 and an image surface 770, wherein the imagingoptical lens assembly has a total of five lens elements (710-750). Thereis an air gap in a paraxial region between every two of the first lenselement 710, the second lens element 720, the third lens element 730,the fourth lens element 740 and the fifth lens element 750 that areadjacent to each other.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being convex in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric.

The second lens element 720 with negative refractive power has anobject-side surface 721 being concave in a paraxial region thereof andan image-side surface 722 being concave in a paraxial region thereof.The second lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with positive refractive power has anobject-side surface 731 being concave in a paraxial region thereof andan image-side surface 732 being convex in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric. The object-side surface 731 of the third lens element 730 hasat least one concave shape in an off-axis region thereof. The image-sidesurface 732 of the third lens element 730 has at least one concave shapein an off-axis region thereof.

The fourth lens element 740 with negative refractive power has anobject-side surface 741 being concave in a paraxial region thereof andan image-side surface 742 being concave in a paraxial region thereof.The fourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric. The image-side surface 742 of the fourth lens element 740 hasat least one convex shape in an off-axis region thereof.

The fifth lens element 750 with positive refractive power has anobject-side surface 751 being convex in a paraxial region thereof and animage-side surface 752 being concave in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric.

The IR-cut filter 760 is made of glass material and located between thefifth lens element 750 and the image surface 770, and will not affectthe focal length of the imaging optical lens assembly. The image sensor780 is disposed on or near the image surface 770 of the imaging opticallens assembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 5.51 mm, Fno = 2.80, HFOV = 27.6 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.331  2 Lens 1 1.589 (ASP)1.058 Plastic 1.530 55.8 2.80 3 −16.975 (ASP) 0.159 4 Lens 2 −4.094(ASP) 0.300 Plastic 1.650 21.5 −6.09 5 124.255 (ASP) 0.140 6 Lens 3−6.082 (ASP) 0.320 Plastic 1.650 21.5 314.00 7 −6.028 (ASP) 0.464 8 Lens4 −7.503 (ASP) 1.358 Plastic 1.544 56.0 −5.32 9 5.007 (ASP) 0.126 10Lens 5 4.990 (ASP) 0.844 Plastic 1.639 23.5 157.21 11 4.905 (ASP) 0.30012 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 0.593 14 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 6 k = −1.5768E+00−9.0000E+01 −3.1153E+01   1.0000E+01 −5.9490E−03 A4 =   4.6815E−02  4.9211E−02   7.6639E−02   4.4098E−02 −7.8960E−02 A6 =   1.0628E−02−4.9534E−02 −2.9895E−01 −4.4876E−01   4.5626E−02 A8 = −1.4105E−02−7.2989E−02   3.9710E−01   1.5900E−01 −1.2220E+00 A10 =   1.6501E−02  6.7737E−02 −6.2028E−01   4.3976E−01   3.4445E+00 A12 = −7.5722E−03  4.5001E−03   6.7615E−01 −5.2115E−01 −3.7655E+00 A14 = — — −2.6225E−01  1.8081E−01   1.4062E+00 A16 = — — — —   3.6434E−02 Surface # 7 8 9 1011 k = −2.2950E+00 −2.5657E+00 −4.9332E+01 −1.3963E+00 −2.2224E−08 A4 =  1.7914E−02 −3.1312E−02   1.6265E−02 −5.8969E−02 −5.5262E−02 A6 =  1.2165E−01   4.9432E−03 −4.4706E−02 −1.3382E−02   3.1679E−04 A8 =−4.9961E−01 −6.7826E−02   2.8393E−02   2.1793E−02   5.6125E−03 A10 =  1.6483E+00   1.4500E−01 −9.5933E−03 −8.8066E−03 −1.9959E−03 A12 =−2.0566E+00 −1.1838E−01   1.7988E−03   1.7182E−03   3.1598E−04 A14 =  1.0427E+00   4.2405E−02 −1.8742E−04 −1.6231E−04 −2.2685E−05 A16 =−1.6147E−01 −5.5378E−03   8.7185E−06   5.8545E−06   5.6680E−07

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 5.51 TL/f 1.07 Fno 2.80 ImgH/f 0.53 HFOV [deg.]27.6 (R3 + R4)/(R3 − R4) −0.94 (V2 + V3 + V5)/(V1 + V4) 0.59 R7/R8 −1.50V4/V5 2.38 f/|R10| 1.12 T23/T12 0.88 (f/f2) + (f/f3) + (f/f4) −1.92T34/(T12 + T23 + T45) 1.09 f/f3 0.02 T34/BL 0.42 f4/f2 0.87

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 880. The imaging optical lens assemblyincludes, in order from an object side to an image side, an aperturestop 800, a first lens element 810, a second lens element 820, a thirdlens element 830, a fourth lens element 840, a fifth lens element 850,an IR-cut filter 860 and an image surface 870, wherein the imagingoptical lens assembly has a total of five lens elements (810-850). Thereis an air gap in a paraxial region between every two of the first lenselement 810, the second lens element 820, the third lens element 830,the fourth lens element 840 and the fifth lens element 850 that areadjacent to each other.

The first lens element 810 with positive refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being convex in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric.

The second lens element 820 with negative refractive power has anobject-side surface 821 being concave in a paraxial region thereof andan image-side surface 822 being concave in a paraxial region thereof.The second lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric.

The third lens element 830 with negative refractive power has anobject-side surface 831 being concave in a paraxial region thereof andan image-side surface 832 being convex in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric. The object-side surface 831 of the third lens element 830 hasat least one concave shape in an off-axis region thereof. The image-sidesurface 832 of the third lens element 830 has at least one concave shapein an off-axis region thereof.

The fourth lens element 840 with negative refractive power has anobject-side surface 841 being concave in a paraxial region thereof andan image-side surface 842 being concave in a paraxial region thereof.The fourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric. The image-side surface 842 of the fourth lens element 840 hasat least one convex shape in an off-axis region thereof.

The fifth lens element 850 with positive refractive power has anobject-side surface 851 being convex in a paraxial region thereof and animage-side surface 852 being concave in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric.

The IR-cut filter 860 is made of glass material and located between thefifth lens element 850 and the image surface 870, and will not affectthe focal length of the imaging optical lens assembly. The image sensor880 is disposed on or near the image surface 870 of the imaging opticallens assembly.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 5.02 mm, Fno = 2.72, HFOV = 29.8 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.300  2 Lens 1 1.531 (ASP)0.799 Plastic 1.544 56.0 2.67 3 −23.299 (ASP) 0.139 4 Lens 2 −4.118(ASP) 0.240 Plastic 1.639 23.5 −6.01 5 57.216 (ASP) 0.173 6 Lens 3−4.555 (ASP) 0.320 Plastic 1.639 23.5 −97.33 7 −5.050 (ASP) 0.648 8 Lens4 −100.000 (ASP) 1.033 Plastic 1.514 56.8 −6.52 9 3.478 (ASP) 0.206 10Lens 5 4.742 (ASP) 1.034 Plastic 1.583 30.2 89.90 11 4.794 (ASP) 0.30012 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 0.403 14 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 6 k = −1.5922E+007.9633E+00 −3.9316E+01 −7.7274E+01  0.0000E+00 A4 =  5.0432E−024.6729E−02  7.9589E−02 4.6920E−02 −1.1093E−01  A6 =  2.6725E−02−4.7605E−02  −2.8671E−01 −3.9498E−01  1.3481E−01 A8 = −5.0624E−02−5.0337E−02   4.2219E−01 1.1603E−01 −1.3013E+00  A10 =  5.9960E−023.8367E−02 −6.4266E−01 4.6847E−01 3.5233E+00 A12 = −3.0597E−021.1333E−02  6.7787E−01 −5.2927E−01  −3.7789E+00  A14 = — — −2.6060E−011.6656E−01 1.4062E+00 A16 = — — — — 1.4135E−03 Surface # 7 8 9 10 11 k =0.0000E+00  1.0000E+00 −2.2251E+01 −1.4014E+00  0.0000E+00 A4 =1.9534E−02 −3.1196E−02  1.8761E−02 −4.7342E−02 −2.8200E−02 A6 =4.4514E−02 −3.2862E−02 −4.4040E−02 −1.2419E−02 −1.4623E−02 A8 =−8.2746E−02   3.9984E−02  2.6969E−02  1.5608E−02  9.2780E−03 A10 =6.6141E−01 −2.0078E−02 −9.3748E−03 −5.8447E−03 −2.5139E−03 A12 =−7.9400E−01   5.3120E−03  1.8064E−03  1.0199E−03  3.6311E−04 A14 =2.8900E−01 −5.8444E−04 −1.8625E−04 −7.4234E−05 −2.6422E−05 A16 =−6.5683E−04   8.0030E−06  8.2384E−06  1.1288E−06  7.5482E−07

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 5.02 TL/f 1.10 Fno 2.72 ImgH/f 0.58 HFOV [deg.]29.8 (R3 + R4)/(R3 − R4) −0.87 (V2 + V3 + V5)/(V1 + V4) 0.68 R7/R8−28.75 V4/V5 1.88 f/|R10| 1.05 T23/T12 1.24 (f/f2) + (f/f3) + (f/f4)−1.66 T34/(T12 + T23 + T45) 1.25 f/f3 −0.05 T34/BL 0.71 f4/f2 1.08

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-16 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An imaging optical lens assembly comprising fivelens elements, the five lens elements being, in order from an objectside to an image side: a first lens element with positive refractivepower having an object-side surface being convex in a paraxial regionthereof; a second lens element with negative refractive power having anobject-side surface being concave in a paraxial region thereof; a thirdlens element having an object-side surface being convex in a paraxialregion thereof; a fourth lens element with negative refractive powerhaving an image-side surface being concave in a paraxial region thereof,wherein the image-side surface of the fourth lens element has at leastone convex shape in an off-axis region thereof, and the image-sidesurface of the fourth lens element is aspheric; and a fifth lenselement; wherein a curvature radius of the object-side surface of thesecond lens element is R3, a curvature radius of an image-side surfaceof the second lens element is R4, an Abbe number of the first lenselement is V1, an Abbe number of the second lens element is V2, an Abbenumber of the third lens element is V3, an Abbe number of the fourthlens element is V4, an Abbe number of the fifth lens element is V5, andthe following conditions are satisfied:(R3+R4)/(R3−R4)<0.50;1.8<V4/V5<3.5; and0.45<(V2+V3+V5)/(V1+V4)<0.75.
 2. The imaging optical lens assembly ofclaim 1, wherein an axial distance between the first lens element andthe second lens element is T12, an axial distance between the secondlens element and the third lens element is T23, an axial distancebetween the third lens element and the fourth lens element is T34, anaxial distance between the fourth lens element and the fifth lenselement is T45, and the following condition is satisfied:1.0<T34/(T12+T23+T45)<4.0.
 3. The imaging optical lens assembly of claim1, wherein a focal length of the imaging optical lens assembly is f, acurvature radius of an image-side surface of the fifth lens element isR10, and the following condition is satisfied:f/|R10|<1.20.
 4. The imaging optical lens assembly of claim 1, whereinthe curvature radius of the object-side surface of the second lenselement is R3, the curvature radius of the image-side surface of thesecond lens element is R4, and the following condition is satisfied:(R3+R4)/(R3−R4)<0.
 5. The imaging optical lens assembly of claim 1,wherein a maximum image height of the imaging optical lens assembly isImgH, a focal length of the imaging optical lens assembly is f, and thefollowing condition is satisfied:0.25<ImgH/f<0.55.
 6. The imaging optical lens assembly of claim 1,wherein an axial distance between the object-side surface of the firstlens element and an image surface is TL, a focal length of the imagingoptical lens assembly is f, and the following condition is satisfied:0.75<TL/f<1.10.
 7. The imaging optical lens assembly of claim 1, whereinan axial distance between the third lens element and the fourth lenselement is T34, an axial distance between an image-side surface of thefifth lens element and an image surface is BL, and the followingcondition is satisfied:1.20<T34/BL<2.5.
 8. The imaging optical lens assembly of claim 1,wherein a focal length of the imaging optical lens assembly is f, afocal length of the second lens element is f2, a focal length of thethird lens element is f3, a focal length of the fourth lens element isf4, and the following condition is satisfied:−4.0<(f/f2)+(f/f3)+(f/f4)<−2.0.
 9. The imaging optical lens assembly ofclaim 1, wherein an axial distance between the first lens element andthe second lens element is T12, an axial distance between the secondlens element and the third lens element is T23, and the followingcondition is satisfied:0<T23/T12<1.75.
 10. The imaging optical lens assembly of claim 1,wherein the fifth lens element has positive refractive power.
 11. Theimaging optical lens assembly of claim 1, wherein the fifth lens elementhas an object-side surface being convex in a paraxial region thereof.12. The imaging optical lens assembly of claim 1, wherein the fifth lenselement has an image-side surface being concave in a paraxial regionthereof.
 13. The imaging optical lens assembly of claim 1, wherein thethird lens element has an image-side surface being concave in a paraxialregion thereof.
 14. An imaging optical lens assembly comprising fivelens elements, the five lens elements being, in order from an objectside to an image side: a first lens element with positive refractivepower having an object-side surface being convex in a paraxial regionthereof; a second lens element with negative refractive power having anobject-side surface being concave in a paraxial region thereof; a thirdlens element; a fourth lens element with negative refractive powerhaving an image-side surface being concave in a paraxial region thereof,wherein the image-side surface of the fourth lens element has at leastone convex shape in an off-axis region thereof, and the image-sidesurface of the fourth lens element is aspheric; and a fifth lenselement; wherein a curvature radius of the object-side surface of thesecond lens element is R3, a curvature radius of an image-side surfaceof the second lens element is R4, an Abbe number of the fourth lenselement is V4, an Abbe number of the fifth lens element is V5, a maximumimage height of the imaging optical lens assembly is ImgH, a focallength of the imaging optical lens assembly is f, and the followingconditions are satisfied:(R3+R4)/(R3−R4)≤−0.30;1.8<V4/V5<3.5; and0.25<ImgH/f<0.55.
 15. The imaging optical lens assembly of claim 14,wherein the focal length of the imaging optical lens assembly is f, acurvature radius of an image-side surface of the fifth lens element isR10, and the following condition is satisfied:f/|R10|<1.20.
 16. The imaging optical lens assembly of claim 14, whereinan axial distance between the first lens element and the second lenselement is T12, an axial distance between the second lens element andthe third lens element is T23, an axial distance between the third lenselement and the fourth lens element is T34, an axial distance betweenthe fourth lens element and the fifth lens element is T45, and thefollowing condition is satisfied:1.0<T34/(T12+T23+T45)<4.0.
 17. The imaging optical lens assembly ofclaim 14, wherein an axial distance between the first lens element andthe second lens element is T12, an axial distance between the secondlens element and the third lens element is T23, and the followingcondition is satisfied:0<T23/T12<1.75.
 18. The imaging optical lens assembly of claim 14,wherein the focal length of the imaging optical lens assembly is f, afocal length of the second lens element is f2, a focal length of thethird lens element is f3, a focal length of the fourth lens element isf4, and the following condition is satisfied:−4.0<(f/f2)+(f/f3)+(f/f4)<−2.0.
 19. The imaging optical lens assembly ofclaim 14, wherein an axial distance between the object-side surface ofthe first lens element and an image surface is TL, the focal length ofthe imaging optical lens assembly is f, and the following condition issatisfied:0.75<TL/f<1.10.
 20. The imaging optical lens assembly of claim 14,wherein an axial distance between the third lens element and the fourthlens element is T34, an axial distance between an image-side surface ofthe fifth lens element and an image surface is BL, and the followingcondition is satisfied:1.20<T34/BL<2.5.
 21. An imaging optical lens assembly comprising fivelens elements, the five lens elements being, in order from an objectside to an image side: a first lens element with positive refractivepower having an object-side surface being convex in a paraxial regionthereof and an image-side surface being concave in a paraxial regionthereof; a second lens element with negative refractive power having anobject-side surface being concave in a paraxial region thereof; a thirdlens element; a fourth lens element with negative refractive powerhaving an image-side surface being concave in a paraxial region thereof,wherein the image-side surface of the fourth lens element has at leastone convex shape in an off-axis region thereof, and the image-sidesurface of the fourth lens element is aspheric; and a fifth lenselement; wherein a curvature radius of the object-side surface of thesecond lens element is R3, a curvature radius of an image-side surfaceof the second lens element is R4, a maximum image height of the imagingoptical lens assembly is ImgH, a focal length of the imaging opticallens assembly is f, and the following conditions are satisfied:(R3+R4)/(R3−R4)<0.50; and0.25<ImgH/f<0.55.
 22. The imaging optical lens assembly of claim 21,wherein an axial distance between the object-side surface of the firstlens element and an image surface is TL, the focal length of the imagingoptical lens assembly is f, and the following condition is satisfied:0.75<TL/f<1.10.
 23. The imaging optical lens assembly of claim 21,wherein an axial distance between the first lens element and the secondlens element is T12, an axial distance between the second lens elementand the third lens element is T23, an axial distance between the thirdlens element and the fourth lens element is T34, an axial distancebetween the fourth lens element and the fifth lens element is T45, andthe following condition is satisfied:1.0<T34/(T12+T23+T45)<4.0.
 24. The imaging optical lens assembly ofclaim 21, wherein an Abbe number of the fourth lens element is V4, anAbbe number of the fifth lens element is V5, and the following conditionis satisfied:1.8<V4/V5<3.5.
 25. The imaging optical lens assembly of claim 21,wherein an Abbe number of the first lens element is V1, an Abbe numberof the second lens element is V2, an Abbe number of the third lenselement is V3, an Abbe number of the fourth lens element is V4, an Abbenumber of the fifth lens element is V5, and the following condition issatisfied:0.45<(V2+V3+V5)/(V1+V4)<0.75.
 26. The imaging optical lens assembly ofclaim 21, wherein an axial distance between the first lens element andthe second lens element is T12, an axial distance between the secondlens element and the third lens element is T23, and the followingcondition is satisfied:0<T23/T12<1.75.